Use of country=00 (world roaming) seemed to not work anymore with the
current cfg80211 regulatory implementation since the existing channel is
left enabled when moving to country=00. Use a specific country code that
does enforce the selected channel from being used anymore to make this
test case pass again.
The change in cfg80211 behavior is from the kernel commit 113f3aaa81bd
("cfg80211: Prevent regulatory restore during STA disconnect in
concurrent interfaces").
Signed-off-by: Jouni Malinen <j@w1.fi>